Experimental Validation of the UHF RFID Dipole Tag Antenna Applied in the Supply Chain

This paper presents a passive UHF RFID dipole antenna designed for object identification in supply chain applications. The antenna features a simple structure measuring 75 × 28 × 1.6 mm 3 (2.17 × 0.81 × 0.046λ 0 ), with a copper radiating element printed on Taconic RF-35A2 substrate. It is matched to a Monza R6 chip with an impedance of 13 - j125 Ω at 868 MHz through a T-matching circuit. The prototype was tested on various complex surfaces, including plastic bottles, foam, cardboard, plastic boxes, and wood. Its performance evaluation involved measuring the reading distances in these environments. Simulation and measurement results demonstrate effective impedance matching between the antenna and chip. The read distances vary with the surface type, with the maximum distance reaching up to 14 meters on a plastic bottle within the European UHF RFID band ((865.5-869.5) MHz) and the shortest distance around 6 meters on wood. Overall, the tag exhibits strong adaptability to different surfaces. Simulations were conducted using CST Studio microwave software.